* "Deaf" is a broad term: It encompasses people with varying degrees of hearing loss, and not everyone who is deaf will use sign language. Some may rely on lip-reading, assistive devices, or spoken language.
* Sign language varies by region and culture: There are many different sign languages around the world, each with its own unique structure and vocabulary.
* Data collection is difficult: Accurately counting how many people use a specific sign language across the globe is challenging.
However, we can say that:
* A significant portion of deaf people use sign language. It's a vital tool for communication, socialization, and cultural expression within the Deaf community.
* The prevalence of sign language use varies: In some countries, like the United States and Canada, sign language is more widely used and accepted. In others, it may be less common.
It's important to remember that the number of people who know sign language is not a measure of how "successful" or "integrated" a Deaf person is. Sign language is simply one of many ways to communicate and connect with the world.